filter_input

(PHP 5 >= 5.2.0, PHP 7, PHP 8)

filter_input — Получает конкретную внешнюю переменную по имени и, если нужно, фильтрует значение переменной

Описание

filter_input(
    int $type,
    string $var_name,
    int $filter = FILTER_DEFAULT,
    array|int $options = 0
): mixed

Список параметров

type

Константа INPUT_GET, INPUT_POST, INPUT_COOKIE, INPUT_SERVER или INPUT_ENV.

var_name

Имя переменной, которую требуется получить.

filter

Идентификатор (ID) фильтра, который требуется применить. Страница «Типы фильтров» приводит список доступных фильтров.

Если параметр опустили, принимается значение по умолчанию FILTER_DEFAULT, которое эквивалентно значению константы FILTER_UNSAFE_RAW. В результате поведением по умолчанию становится отсутствие фильтрации.

options

Ассоциативный массив параметров или флаги через побитовое ИЛИ. Если фильтр принимает параметры, флаги можно указать в массиве в элементе "flags".

Возвращаемые значения

Функция возвращает значение запрошенной переменной в случае успешного выполнения, false, если фильтрация не удалась, или null, если переменную var_name не установили. Если установили флаг FILTER_NULL_ON_FAILURE, а переменную не установили, функция возвращает false, и null, если фильтрация не удалась.

Примеры

Пример #1 Пример использования функции filter_input()

<?php

$search_html = filter_input(INPUT_GET, 'search', FILTER_SANITIZE_SPECIAL_CHARS);
$search_url = filter_input(INPUT_GET, 'search', FILTER_SANITIZE_ENCODED);
echo "Вы искали $search_html.\n";
echo "<a href='?search=$search_url'>Искать снова.</a>";

?>

Вывод приведённого примера будет похож на:

Вы искали Me &#38; son.
<a href='?search=Me%20%26%20son'>Искать снова.</a>

Смотрите также

filter_var() - Фильтрует переменную
filter_input_array() - Получает несколько переменных извне PHP и, при необходимости, фильтрует их
filter_var_array() - Принимает несколько переменных и, при необходимости, фильтрует их
Типы фильтров

Улучшение страницы

Инструкция • Исправление • Сообщение об ошибке

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Примечания пользователей 9 notes

down

100

CertaiN ¶

10 years ago

This function provides us the extremely simple solution for type filtering.

Without this function...
<?php
if (!isset($_GET['a'])) {
    $a = null;
} elseif (!is_string($_GET['a'])) {
    $a = false;
} else {
    $a = $_GET['a'];
}
$b = isset($_GET['b']) && is_string($_GET['b']) ? $_GET['b'] : '';
?>

With this function...
<?php
$a = filter_input(INPUT_GET, 'a');
$b = (string)filter_input(INPUT_GET, 'b');
?>

Yes, FILTER_REQUIRE_SCALAR seems to be set as a default option. 
It's very helpful for eliminating E_NOTICE, E_WARNING and E_ERROR. 
This fact should be documented.

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anthony dot parsons at manx dot net ¶

17 years ago

FastCGI seems to cause strange side-effects with unexpected null values when using INPUT_SERVER and INPUT_ENV with this function. You can use this code to see if it affects your server:
<?php
var_dump($_SERVER);
foreach ( array_keys($_SERVER) as $b ) {
    var_dump($b, filter_input(INPUT_SERVER, $b));
}
echo '<hr>';
var_dump($_ENV);
foreach ( array_keys($_ENV) as $b ) {
    var_dump($b, filter_input(INPUT_ENV, $b));
}
?>
If you want to be on the safe side, using the superglobal $_SERVER and $_ENV variables will always work. You can still use the filter_* functions for Get/Post/Cookie without a problem, which is the important part!

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rimelek at rimelek dot hu ¶

10 years ago

If your $_POST contains an array value:
<?php
$_POST  = array(
    'var' => array('more', 'than', 'one', 'values')
);
?>
you should use FILTER_REQUIRE_ARRAY option:
<?php
var_dump(filter_input(INPUT_POST, 'var', FILTER_DEFAULT , FILTER_REQUIRE_ARRAY));
?>
Otherwise it returns false.

down

ss23 at ss23 dot geek dot nz ¶

14 years ago

Note that this function doesn't (or at least doesn't seem to) actually filter based on the current values of $_GET etc. Instead, it seems to filter based off the original values.
<?php
$_GET['search'] = 'foo'; // This has no effect on the filter_input

$search_html = filter_input(INPUT_GET, 'search', FILTER_SANITIZE_SPECIAL_CHARS);
$search_url = filter_input(INPUT_GET, 'search', FILTER_SANITIZE_ENCODED);
echo "You have searched for $search_html.\n";
echo "<a href='?search=$search_url'>Search again.</a>";
?>

If you need to set a default input value and filter that, use filter_var on your required input variable instead

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Stefan Weinzierl ¶

10 years ago

Here is an example how to work with the options-parameter. Notice the 'options' in the 'options'-Parameter!

<?php
$options=array('options'=>array('default'=>5, 'min_range'=>0, 'max_range'=>9));

$priority=filter_input(INPUT_GET, 'priority', FILTER_VALIDATE_INT, $options);
?>

$priority will be 5 if the priority-Parameter isn't set or out the given range.

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chris at chlab dot ch ¶

12 years ago

To use a class method for a callback function, as usual, provide an array with an instance of the class and the method name.
Example:

<?php
class myValidator
{
  public function username($value)
  {
    // return username or boolean false
  }
}

$myValidator = new myValidator;
$options = array('options' => array($myValidator, 'username'));
$username = filter_input(INPUT_GET, 'username', FILTER_CALLBACK, $options);
var_dump($username);
?>

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akshay dot leadindia at gmail dot com ¶

11 years ago

The beauty of using this instead of directly using filter_var( $_GET['search'] ) is that you don't need to check if( isset( $_GET['search'] ) ) as if you pass that to filter_var and the key is not set then it will result in a warning. This function simplifies this and will return the relevant result to you (as per your options set) if the key has not been set in the user input. 

If the type of filter you are using also supports a 'default' argument then this function will also stuff your missing input key with that value, again saving your efforts

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travismowens at gmail dot com ¶

14 years ago

I wouldn't recommend people use this function to store their data in a database.  It's best not to encode data when storing it, it's better to store it raw and convert in upon the time of need.

One main reason for this is because if you have a short CHAR(16) field and the text contains encoded characters (quotes, ampersand) you can easily take a 12 character entry which obviously fits, but because of encoding it no longer fits.

Also, while not as common, if you need to use this data in another place, such as a non webpage (perhaps in a desktop app, or to a cell phone SMS or to a pager) the HTML encoded data will appear raw, and now you have to decode the data.

In summary, the best way to architect your system, is to store data as raw, and encode it only the moment you need to.  So this means in your PHP upon doing a SQL query, instead of merely doing an   echo $row['title']  you need to run htmlentities() on your echos, or better yet, an abstract function.

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HonzaZ ¶

2 years ago

In fastcgi sapi implementations, filter_input(INPUT_SERVER) can return empty results.

In my case (8.1.9 64bit php-cgi) it was caused by auto_globals_jit enabled . When disabled (in php.ini on php startup), filter_input(INPUT_SERVER) works correctly.

php-fpm sapi isn't affected.

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